US4867919A
Expired / Lapsed
US
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Method of making a gas sensor
Assignee: Terumo Cardiovascular Systems Corp
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Filing: 1989-01-26
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Granted: 1989-09-19
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Expires: 2009-01-26
Abstract
Abstract A method for preparing a gas sensor includes forming a mixture containing an aqueous buffer solution including a dissolved dye, a polymeric precursor of a cross-linked polymeric material, and a cross-linking agent and reacting the polymeric precursor and the cross-linking agent in the mixture to form a gas sensor including micro-compartments of the aqueous buffer solution dispersed in the cross-linked polymeric material.
Inventors
- 👤 Masao Yafuso
- 👤 John K. Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:40
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N21/6428; G01N21/643; A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/1459; G01N31/00; G01N31/22; G01N31/223; G01N2021/6434; G01N21/75; G01N21/77; G01N21/78; G01N21/81
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
62 words
A method for preparing a gas sensor comprising: forming a mixture containing an aqueous buffer solution including a dissolved dye, a polymeric precursor of a cross-linked polymeric material, and a cross-linking agent; and reacting said polymeric precursor and said cross-linking agent in said mixture to form a gas sensor comprising micro-compartments of said aqueous buffer solution dispersed in said cross-linked polymeric material.
Claim 2
Independent Claim
62 words
A method for preparing a gas sensor comprising: forming a mixture containing an aqueous buffer solution including a dissolved dye, a polymeric precursor of a cross-linked polymeric material, and a cross-linking agent; and reacting said polymeric precursor and said cross-linking agent in said mixture to form a gas sensor comprising micro-compartments of said aqueous buffer solution dispersed in said cross-linked polymeric material.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said mixture is an emulsion.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said aqueous buffer solution further includes an emulsification enhancement agent.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein said cross-linked polymeric material is gas and light permeable, and substantially ion and aqueous impermeable.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein said dye is present in said aqueous buffer solution in a concentration in the range of about 2 millimolar to about 50 millimolar.
Claim 7
Dependent Claim
28 words
The method of claim 1 wherein said aqueous buffer solution includes a buffer present in a concentration in the range of about 2 millimolar to about 50 millimolar.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein said mixture includes about 1 gram to about 4 grams of said aqueous buffer solution per 10 grams of said polymeric precursor.
Claim 9
Dependent Claim
27 words
The method of claim 1 wherein said mixture includes about 0.5 grams to about 2 grams of said cross-linking agent per 10 grams of said polymeric precursor.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein said mixture further includes a catalyst effective to promote said reaction.
Claim 11
Dependent Claim
31 words
The method of claim 3 herein said emulsification enhancement agent is present in an amount in the range of about 10% to about 30% by weight of said aqueous buffer solution.
Claim 12
Dependent Claim
13 words
The method of claim 1 wherein said dye is a pH sensitive dye.
Claim 13
Dependent Claim
17 words
The method of claim 1 wherein said aqueous buffer solution is a bicarbonate ion based buffer solution.
Claim 14
Dependent Claim
14 words
The method of claim 1 wherein said gas sensor is a carbon dioxide sensor.
Claim 15
Dependent Claim
18 words
The method of claim 1 wherein said dye is hydroxypyrene 3, 6, 8-trisulfonic acid or a salt thereof.
Claim 16
Dependent Claim
13 words
The method of claim 1 wherein said micro-compartments are smaller than 5 microns.
Claim 17
Dependent Claim
74 words
The method of claim 1 wherein said dye is present in said mixture in an amount of about 0.01 grams per 2 mls. of said aqueous buffer solution, said aqueous buffer solution is present in said mixture in an amount of about 2 mls. per 10 grams of said polymeric precursor, and said cross-linking agent is present in said mixture in an amount of about 1 gram per 10 grams of said polymeric precursor.
Claim 18
Dependent Claim
28 words
The method of claim 16 wherein said aqueous buffer solution further includes about 0.66 grams of an emulsification enhancement agent per 2 mls of said aqueous buffer solution.
Claim 19
Dependent Claim
23 words
The method of claim 1 which further comprises placing said mixture on the end of an optic fiber prior to said reacting step.
Claim 20
Independent Claim
77 words
A method for preparing a carbon dioxide sensor comprising: forming a mixture containing an aqueous buffer solution including a dissolved pH sensitive dye, a polymeric precursor of a cross-linked, light and gas permeable, substantially ion and aqueous impermeable polymeric material, a cross-linking agent and a catalyst; and reacting said polymeric precursor and said cross-linking agent in said mixture to form a carbon dioxide sensor comprising micro-compartments of said aqueous buffer solution dispersed in said cross-linked polymeric material.
Claim 21
Independent Claim
77 words
A method for preparing a carbon dioxide sensor comprising: forming a mixture containing an aqueous buffer solution including a dissolved pH sensitive dye, a polymeric precursor of a cross-linked, light and gas permeable, substantially ion and aqueous impermeable polymeric material, a cross-linking agent and a catalyst; and reacting said polymeric precursor and said cross-linking agent in said mixture to form a carbon dioxide sensor comprising micro-compartments of said aqueous buffer solution dispersed in said cross-linked polymeric material.
Claim 22
Dependent Claim
23 words
The method of claim 19 which further comprises placing said mixture on the end of an optical fiber prior to said reacting step.
References Cited (Backward Citations)
US31879A
Cited
US3335715A
Cited
US3674013A
Cited
US3822695A
Cited
US3866599A
Cited
US3904373A
Cited
US4107245A
Cited
USRE31879E
Cited
US4200110A
Cited
US4194877A
Cited
US4577109A
Cited
US4560248A
Cited
US4509522A
Cited
US4557900A
Cited
US4784811A
Cited
US4487206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |